[Bug 1871850] Please test proposed package

[Corey Bryant]

Hello LIU, or anyone else affected,

Accepted neutron into queens-proposed. The package will build now and be
available in the Ubuntu Cloud Archive in a few hours, and then in the
-proposed repository.

Please help us by testing this new package. To enable the -proposed
repository:

  sudo add-apt-repository cloud-archive:queens-proposed
  sudo apt-get update

Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-queens-needed to verification-queens-done. If it does
not fix the bug for you, please add a comment stating that, and change
the tag to verification-queens-failed. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!

** Changed in: cloud-archive/queens
       Status: Triaged => Fix Committed

** Tags added: verification-queens-needed

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https://bugs.launchpad.net/bugs/1871850

Title:
  [L3] existing router resources are partial deleted unexpectedly when
  MQ is gone

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive queens series:
  Fix Committed
Status in Ubuntu Cloud Archive rocky series:
  Fix Committed
Status in Ubuntu Cloud Archive stein series:
  Fix Released
Status in Ubuntu Cloud Archive train series:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  Fix Released
Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Bionic:
  Fix Committed

Bug description:
  (For SRU template, please see bug 1869808, as the SRU info there
  applies to this bug also)

  ENV: meet this issue on our stable/queens deployment, but master
  branch has the same code logic

  When the L3 agent get a router update notification, it will try to
  retrieve the router info from DB server [1]. But at this time, if the
  message queue is down/unreachable. It will get exceptions related
  message queue. A resync action will be run then [2]. Sometimes, from
  my personal experience, rabbitMQ cluster is not so much easy to
  recover. Long time MQ recover time will cause the router info sync RPC
  never get successful until it meets the max retry time [3]. So the bad
  thing happens, L3 agent is trying to remove the router now [4]. It
  basically shutdown all the existing L3 traffic of this router.

  [1] https://github.com/openstack/neutron/blob/master/neutron/agent/l3/agent.py#L705
  [2] https://github.com/openstack/neutron/blob/master/neutron/agent/l3/agent.py#L710
  [3] https://github.com/openstack/neutron/blob/master/neutron/agent/l3/agent.py#L666
  [4] https://github.com/openstack/neutron/blob/master/neutron/agent/l3/agent.py#L671

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